Time Machine back-up error 19

do you have any idea why there is a (2)? could it have abandoned to old sparesebundle and be starting a new one?

whatever the answer, it sounds like errors are devloping on the drive holding the sparse bundle file, and the drive need to be at least repaired, and possibly ERASEd to start over.

Erase will test all the suspicious blocks on the drive controller's 'suspected bad' list, and substitute spare blocks for ones found bad after erasing and checking.

You could try holding Option when clicking on the Time machine icon on the menuBar. if a backup is not in progress, it may offer a 'Verify Backups' choice. this I=will check the integrity of the backup DATA (but not the drive itself.)

I think you use Airport Utility to check and erase the Time Capsule Physical drive.

What verify backups does is cje=heck the data integrity of your backups. since it reports your backups have lost integrity, there is no penalty for staring over.

Time machine can support multiple backup devices, with widely different connection methods. if you add an additional backup device, every-other backup will go to every other drive, and either drive can be removed at any time, such as to start over.

If you are concerned at having NO backups while you do this recovery, you could start an additional backup on a different drive.

is that error 19, or error -19?

You can try this, but it sounds like you have to start over again with a new backup:

back-up error Time capsule - Apple Community