How to save a lot of storage space on your long-running Nextcloud instance

If you happen to run a self-hosted Nextcloud instance for several years, and happen to watch or share a lot of photos through its web application, you might benefit from this tip:

Have a look at the size of folder data/appdata_<random-part>/preview. On my instance, it had grown larger than an single user’s whole files. The solution, as posted by user Rulizer on Github back in 2018, is to purge the image preview cache:

  1. Delete folder preview in data/appdata
  2. occ files:scan-app-data

Step 2 might take some time to complete (it took about 10 minutes in my case). The only downside is that now all image previews need to be regenerated once.






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