I have collected some useful information for you. The number of inodes equals the total number of files and folders on your web hosting account. In case your account has reached the limit on the number of inodes it contains, here are some tips on how to reduce their number:
1. Remove all files/folders you don’t need
There may be some backup files/folders placed outside your public_html web root folder or situated inside it, which are generated by an extension installed inside your website application. If you need some of these files you can download them locally on your computer through FTP and after that remove them from your hosting account.
2. Check the number of cache files you have
Applications such as Joomla can generate a lot of cache files, which are increasing the amount of the inodes for your hosting account. You should regularly check your cache folder and reduce the number of cached files you keep. Most of the applications, which are caching content have the so-called Purge cache functionality inside their administrative area, which can be used for clearing such files.
3. Remove old mails
Removing all old mails may help you to reduce inode count . Before proceeding you may take backup of your old mails through mail client like outlook .
If you have a large number of files/folders and reducing their number is not a suitable option for you, you may consider upgrading your account to a higher hosting plan with a higher inodes quota.