In the web3 ecosystem, decentralised storage platforms leverage distributed networks, incentive mechanisms, and cryptographic techniques to provide data storage for dAps. Let's have an overview of them:

1. Filecoin

Filecoin is a decentralized storage network that allows users to store and retrieve data in a decentralized manner. It leverages an incentive layer and blockchain-based markets to reward miners for providing storage capacity.

Uses proof-of-spacetime cryptography to verify storage over time
Economic incentives for storage providers (miners) via block rewards
Stores data based on content addressing and retrieves through miners
It is backed by Protocol Labs and provides tools/libraries for integration

2. Arweave

Arweave brands itself as a decentralized storage permaweb designed for permanent data storage. It uses a novel proof-of-access blockchain protocol.

Permanently stores data with incentives for redundant archiving
Pays "miners" that provide storage endowments from network fees
Resources are content-addressed and immutable once stored
Provides a hosted HTTP gateway and developer libraries

3. Storj

Storj is a decentralized cloud storage platform that uses a network of node operators to store data securely and in a distributed manner.

No blockchain uses a quorum of verification nodes instead
Storage node operators earn STORJ tokens for providing capacity
Data is end-to-end encrypted before storing on the node network
Provides S3-compatible gateways and developer tools/libraries

4. InterPlanetary File System (IPFS)

The InterPlanetary File System (IPFS) is a protocol, network and stack for decentralized storage and content addressing. Filecoin also builds on IPFS.

IPFS nodes form a distributed network for content addressing/routing
Filecoin incentivizes storage providers to hold IPFS content long-term
Projects like NFT.Storage, web3.storage build on IPFS/Filecoin
Developer tools like IPFS Desktop, implementations in all languages

Choosing the platform to use for storage depends on the needs and requirements of your project. Do your research and keep on learning!