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I just run a disk analyer for my ubuntu 12.04. I found there is a huge folder under this directory ~/.cache/deja-dup. All the files inside name like duplicity-full.20121019T115047Z.manifest.part / duplicity-full-signatures.20121019T115047Z.sigtar.part

But it contain more than 5G file there. Anyone have any idea what is this file regarding??

Can I delete them as they are eating up my disk storage.

Thank you.

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up vote 7 down vote accepted

Firstly, this is not the system cache. The system cache is a cache that resides in memory and occupies physical memory that is not otherwise used by applications.

This is a .cache folder inside your home directory, so not system-wide at all. You can, if you need the space, safely delete it (only a misbehaving program would die if you delete stuff it's put in ~/.cache).

To answer your question though, deja-dup is a backup tool provided by Ubuntu. The cache probably helps it keep track of all the files in your backup sets. It probably saves a fair bit of time re-generating this information each time the backup process starts. Every file in your backup sets, it appears, has signatures stored in a cache.

5G does sound like a lot, though. If you don't use deja-dup, or you don't care about it losing its cache and being a lot more slow next time it starts, you could delete it.

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Thank you for your information and correcting my knowledge. Thanks a lot!!! I have a clear picture now!! –  user1343112 Jun 12 '13 at 2:42
    
for confirmation: answers.launchpad.net/deja-dup/+question/184246 –  don.joey May 14 at 11:23
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