It's quite simple, on each server where the files are deletable,
you're able to rename them, too. So, after you've uploaded a file you must
rename it to:
filename ./ /
that means [filename][space][dot]/[space]/
After done so, the file will be still downloadable, but only deletable by the
Sysadmin.
If you use a FlashFXP as ftp-client, you can make a custom command for that.
In the menu choose Commands/Edit Commands... (or press F7), then under Custom Commands
click on Add Cmd and type something like "Make Non-Deletable" as name. Choose a key
as shortcut and in the bottom window under Command type the following:
rnfr %f
rnto %f ./ /
Hint: hit ENTER to change to the second line.
Now you're able to make selected files non-deletable by using the shortcut or choose
from the context-menu Commands/Make Non-Deletable.
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