Backup all EAs, indicators, scripts, files, templates and so on (in Metatrader: File - Open Data Folder and backup everything inside MQL4 folder).
Store the login/password (master password and investor password in case you were provided by investor password) to your trading account and to your VPS.
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If you know how to use the storage so you can use storage for backup (it is for MT5 but it is almost the same for MT4 for example) -

Recover mq5 file missing in compiling process
- 2020.09.06
- www.mql5.com
Hi.. I was in the process of compiling my mq5 file, say abc...

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I have downloaded a number of EA sets onto my mt4 platform.
I have deleted the EAs but wish to reinstall my Mt4 so that I have a clean platform again.
How do I do that without losing my VPS connection and my connection to my broker?
Step by step please as I am new to mt4