Syncovery Support Forum

I backed up 1.5 TB of files to Backblaze B2 and I had them compressed + encrypted.

Now I want to do some kind of integrity checking/verification.

I would assume the process would do something like:

1. Compress + encrypt the file locally
2. Calculate the file hash
3. Compare the local file hash with the hash of the compressed + encrypted file on Backblaze B2 (since B2 tells you file hash)

Does this make sense?

Hello,
no, it cannot work this way. Encrypted files are always different due to salting. Their hashes cannot be compared.

The only way to verify the files is to download them and decrypt/decompress them.

You can use "Binary Comparison" on the tab sheet "Comparison" -> "More" to do this. Use the checkmark "Remember Results" to avoid verifying the same file again if the comparison job is started another time.

If you would like to verify only a subset, to save time and bandwidth, you can use a filter such as File Age: less than 100 days.

As an alternative, you can right-click a profile and choose "Test Backup Integrity". This will also download and unpack the files, but it won't compare them to the originals. The process might be a little faster, and verification against the checksums embedded in compressed archives is usually sufficient.

Got it. Thank you!