couchbase backup utility should run integrity check after backup and before vacuuming

one of the users reported :

Backup of default done
Vacuum
of default done
Backup of default-0.mb done
Error: database disk image is malformed
Vacuum of default-0.mb done
Backup of default-1.mb done
Error: database disk image is malformed
Vacuum of default-1.mb done
Backup of default-2.mb done
Vacuum of default-2.mb done
Backup of default-3.mb done
Error: database disk image is malformed
Vacuum of default-3.mb done

the user then ran integrity check on the corrupted backup shard :

-sh-3.2$ /opt/couchbase/bin/sqlite3 default-1.mb
SQLite version 3.7.2
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> PRAGMA integrity_check;

• • • in database main ***
      On tree page 6543 cell 0: 4 of 6 pages missing from overflow list starting at 2719613
      On tree page 7161 cell 0: 2 of 6 pages missing from overflow list starting at 3548396
      On tree page 347385 cell 0: 1 of 2 pages missing from overflow list starting at 4781681
      On tree page 248234 cell 0: 2nd reference to page 5647436
      On tree page 361270 cell 0: 2 of 3 pages missing from overflow list starting at 4384604
      On tree page 505716 cell 0: 5 of 8 pages missing from overflow list starting at 1540962
      On tree page 1298298 cell 0: 8 of 12 pages missing from overflow list starting at 5226912
      On tree page 1490361 cell 0: 1 of 2 pages missing from overflow list starting at 5517260
      On tree page 1559833 cell 0: 1 of 2 pages missing from overflow list starting at 3237937
      On tree page 1408893 cell 0: 13 of 19 pages missing from overflow list starting at 2522699
      On tree page 3001939 cell 0: 2nd reference to page 4510212
      On tree page 1331840 cell 0: 1 of 2 pages missing from overflow list starting at 5378314
      On tree page 2068325 cell 0: 11 of 12 pages missing from overflow list starting at 3128187
      On tree page 2210730 cell 0: 7 of 8 pages missing from overflow list starting at 5482006
      On tree page 1540338 cell 0: 2nd reference to page 3862335
      On tree page 1958772 cell 0: 1 of 2 pages missing from overflow list starting at 3120119
      On tree page 2899988 cell 0: 2nd reference to page 5482006
      On tree page 3477578 cell 0: 2nd reference to page 5518857
      On tree page 3606737 cell 0: 2nd reference to page 5227907
      On tree page 4500400 cell 0: 2 of 3 pages missing from overflow list starting at 2081640
      On tree page 2648274 cell 0: 1 of 2 pages missing from overflow list starting at 4268285
      On tree page 1589224 cell 0: 2nd reference to page 3548396
      On tree page 3239597 cell 0: 2nd reference to page 2010905
      On tree page 4433825 cell 0: 2nd reference to page 4062110
      On tree page 882949 cell 0: 2nd reference to page 4438689
      On tree page 2696470 cell 0: 1 of 2 pages missing from overflow list starting at 5485665
      On tree page 1805738 cell 0: 1 of 2 pages missing from overflow list starting at 5360333
      On tree page 4680065 cell 1: 2nd reference to page 3371159
      On tree page 4506277 cell 0: 1 of 2 pages missing from overflow list starting at 2827305
      On tree page 4719656 cell 0: 1 of 2 pages missing from overflow list starting at 1688045
      On tree page 3116190 cell 0: 2nd reference to page 1409168
      On tree page 5509032 cell 0: 2nd reference to page 4165388
      On tree page 2049533 cell 1: Rowid 105665 out of order (max larger than parent max of 105661)
      On tree page 5494237 cell 0: Rowid 105662 out of order (min less than parent min of 105665)
      On tree page 5538158 cell 1: 2nd reference to page 2950787
      On tree page 3449976 cell 0: 2nd reference to page 875478
      On tree page 1605890 cell 4: 2 of 3 pages missing from overflow list starting at 4643092
      On tree page 1605890 cell 4: Rowid 108215 out of order (max larger than parent max of 108210)
      On tree page 2800825 cell 0: Rowid 108216 out of order (max larger than parent max of 108214)
      On tree page 3338950 cell 0: Rowid 108215 out of order (min less than parent min of 108216)
      On tree page 3433440 cell 0: 2nd reference to page 1424424
      Page 2457439: btreeInitPage() returns error code 11
      On tree page 5607184 cell 75: Child page depth differs
      On tree page 5607184 cell 76: Child page depth differs
      On tree page 486521 cell 0: 2 of 4 pages missing from overflow list starting at 316405
      On tree page 493239 cell 0: 1 of 2 pages missing from overflow list starting at 5351072
      On tree page 493208 cell 0: 1 of 2 pages missing from overflow list starting at 5256055
      On tree page 160940 cell 0: 1 of 2 pages missing from overflow list starting at 5554097
      On tree page 1019204 cell 0: 2 of 3 pages missing from overflow list starting at 4217052
      On tree page 1218789 cell 0: 2nd reference to page 316405
      On tree page 1549565 cell 0: 1 of 4 pages missing from overflow list starting at 4112133
      On tree page 1129128 cell 0: 1 of 3 pages missing from overflow list starting at 3874575
      On tree page 1558712 cell 0: 1 of 2 pages missing from overflow list starting at 5279593
      On tree page 1892214 cell 0: 1 of 2 pages missing from overflow list starting at 5586509
      On tree page 1300281 cell 0: 1 of 2 pages missing from overflow list starting at 5285166
      On tree page 1220910 cell 0: 2 of 3 pages missing from overflow list starting at 5128098
      On tree page 3070292 cell 1: 2nd reference to page 5555189
      On tree page 3181687 cell 0: 2nd reference to page 5255690
      On tree page 3560123 cell 0: 2nd reference to page 1630143
      On tree page 2748034 cell 0: 1 of 2 pages missing from overflow list starting at 3993856
      On tree page 3705983 cell 0: 2nd reference to page 5599995
      On tree page 2152439 cell 0: 1 of 2 pages missing from overflow list starting at 3400534
      On tree page 425083 cell 2: 1 of 2 pages missing from overflow list starting at 4305563
      On tree page 3605923 cell 0: 2nd reference to page 3024261
      On tree page 4305105 cell 0: 2nd reference to page 3436968
      On tree page 3872405 cell 0: 1 of 2 pages missing from overflow list starting at 1230546
      On tree page 1399679 cell 0: 1 of 2 pages missing from overflow list starting at 3257397
      On tree page 924249 cell 0: 1 of 2 pages missing from overflow list starting at 5482794
      On tree page 3578548 cell 0: 2nd reference to page 5482794
      On tree page 635650 cell 0: 10 of 11 pages missing from overflow list starting at 5430517
      On tree page 782697 cell 0: 1 of 2 pages missing from overflow list starting at 5594886
      On tree page 3021006 cell 0: 1 of 2 pages missing from overflow list starting at 2120611
      On tree page 4798998 cell 0: 2nd reference to page 917219
      On tree page 666848 cell 0: 1 of 2 pages missing from overflow list starting at 4444655
      On tree page 5260799 cell 0: 2nd reference to page 5430517
      On tree page 5431912 cell 0: 2nd reference to page 4444655
      On tree page 5473718 cell 0: 1 of 2 pages missing from overflow list starting at 727464
      On tree page 932894 cell 3: Rowid 105594 out of order (max larger than parent max of 105590)
      On tree page 4125868 cell 1: 2nd reference to page 4681418
      On tree page 4125868 cell 2: Rowid 105591 out of order (min less than parent min of 105594)
      On tree page 5500578 cell 0: 2nd reference to page 3691475
      On tree page 5505656 cell 2: 2nd reference to page 4996604
      On tree page 5316722 cell 0: 2nd reference to page 1606735
      Page 550004: btreeInitPage() returns error code 11
      On tree page 5541521 cell 63: Child page depth differs
      On tree page 5541521 cell 64: Child page depth differs