I want to know about the best way to restore hard disk data in case of any accidental deletion of file. Is there any need of data storage strategy to eliminate any damage consequences?

Its called a 'back up'.

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Zero Alpha > https://zeroalpha.com.au

Thank you friend...

You should not only consider corruption of a few files but

1. Sudden failure of your harddisk - in (the rare) worst case even an expensive data recovery will not help
2. sudden defect of your operating system
3. sudden defect of your computer hardware (mainboard)

There are quite some back up software solutions on a market - but what they dont tell you is
the correct time needed to restore your system.

- you can either reinstall your operating system and all your software and (internet) communication
- or you have a full back up (from a specific date) - and perhaps the changed / added data

Even with a raid1 hdd system (1:1 mirror with 2 harddisks containing the same data) will not help
with following problems:
- overvoltage caused by (internal pc) power supply damaging both harddisks
- system crash or virus (its immediately on BOTH) harddisks.

When you have a full back up solution (Acronis, Ghost, DriveClone or similar) you have to consider
that it will take about 3 hours for a 300GB drive to be restored.
For an office system this is about half of the day to have it run again.

But - even then you are not on safe side: I had it happen last year, that at 95% restored, the programe
advised me, that the backup is faulty .... it took me another 10 hours to get the system to work again.

I found now the best (for me) solution:
- Raid1 external box - building a new clone on the fly every day.
- take out the clone in the evening and store it on save place
- daily changes of important data is stored regularely on a 2nd external device (NAS)

In case of need I have a 2 day old working system - and can add the extra data of the last day within
a few minutes. I tested that 2 weeks ago and all together took only 15 mins.

Unfortunately this will not help at a sudden defect of your computer hardware (mainboard).
For Windows XP one could do a "Repair Installation" - which keeps all programs and installations untouched,
but installes onto a new hardware
With Vista that was/is not possible
I have no knowledge yet whether or how it could work with Win7 (any information is wellcome!).

Thats definitely a complete overview - and you decide now

+++

falther you have given information based on technical concept.
great post...