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# Orphaned Files
An orphaned file is a backup file that should not exist. For example, while a `.zip` file is being written
it may temporarily be named `backup.zip.JIE4T9A`. When the file is successfully written, the random `JIE4T9A`
extension will be removed.
If the backup process is killed, the orphaned `backup.zip.JIE4T9A` file will exists and just take up
space. It should be removed.
## Naming Conventions
### PclZip ###
PclZip does not appear to store `.zip` files anywhere temporarily while they're written. Testing shows
backup files are written in the permanent location using the permanent filename.
```
/home/user/boldgrid_backup/backup.zip
```
### ZipArchive ###
ZipArchive will append a random string to the end of the file, such as `backup.zip.hzWRMm`, and then
remove it when the file is written.
```
/home/user/boldgrid_backup/backup.zip.hzWRMm
```
### System Zip ###
We've setup System Zip to archive files in a separate folder, and then move them when done.
```
/home/user/boldgrid_backup/system-zip-temp/zi5XqLpx
```
In testing, when the backup process received a `kill -9`, the zip file was created, but it was incomplete:
```
/home/user/boldgrid_backup/backup.zip
```
Running a test command still showed the zip was valid.
```
unzip -t backup.zip
Archive: backup.zip
testing: domain.20200605-181832.sql OK
testing: domain.log OK
No errors detected in compressed data of backup.zip.
```
As you can see, it looks like only 2 files, the `.sql` file and the `.log` file were written.