Update README

README.md

@@ -1,16 +1,14 @@
 ## Caches manager
 
-A simple script that helps keep selected directories clean by symlinking or binding to tmpfs ramdisk. 
+A simple script that helps keep selected directories clean by symlinking or mounting to tmpfs ramdisk. 
 Useful for temporary, cache and other junk directories. 
 
 ### Usage
 
-1. Enable both system and user services.
+1. Enable system and/or user services.
 
-```
-# systemctl enable caches-manager.service
-# systemctl --global enable caches-manager.service
-```
+  # systemctl enable caches-manager.service
+  $ systemctl --user enable caches-manager.service
 
 2. Make your configs.
 
@@ -20,19 +18,19 @@ The script reads all `.conf` files from respective directories:
 - `$XDG_CONFIG_HOME/caches-manager` (`~/.config/caches-manager`) - per-user configs.
 
 Configs are read as one path per line. Default mode of operation is to symlink the directory. 
-If you want to use bind mount instead, prefix the path with `b:`. Bind mounts are more failsafe and keep actual directories if the service disabled/uninstalled, so they are preferred for system directories. 
+If you want to use mount instead, prefix the path with `b:`. Mounts require root privileges but more failsafe and keep actual directories if the service was disabled/uninstalled, so they are preferred for system directories. 
 System-wide configs require full absolute paths (e.g. `b:/var/cache`). 
 User configs treat paths relative to user home directory (e.g. `.cache` will be resolved to `~/.cache`). 
 
-**WARNING!** All content in the target directories will be purged! 
-Ensure that the target directories do not contain any valuable data. Tmpfs keeps data in RAM and drops it on every shutdown or reboot. 
+**WARNING!** Tmpfs keeps data in RAM and drops it on every shutdown or reboot. 
+The app will backup existing non-empty directories just in case. 
 
 3. Changes will be applied on the next boot (or user log-in in case of user service). You can force changes by executing the services or running the script manually, but this is not recommended.
 
 ### Packages
 
 **Arch Linux**
-- [caches-manager](https://aur.archlinux.org/packages/caches-manager) <sup>AUR</sup>
+- [`caches-manager`](https://aur.archlinux.org/packages/caches-manager) <sup>AUR</sup>
 
 ### Manual installation